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Amount of assets acquired at the acquisition date.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Acquisitions (Details)				3 Months Ended
Acquisitions (Details)	Jan. 01, 2017 USD ($)	Jun. 18, 2016 USD ($)	Jan. 05, 2016 USD ($) customer	Mar. 31, 2017 USD ($)	Apr. 01, 2016 USD ($)	Dec. 30, 2016 USD ($)	Jul. 01, 2016
Acquisitions
Revenues				$ 201,312,000	$ 153,698,000
Operating income				7,064,000	7,736,000
Approximate fair value estimates of the assets acquired and liabilities assumed
Goodwill				427,868,000		$ 305,476,000
LTS
Approximate fair value estimates of the assets acquired and liabilities assumed
Interest acquired (as a percent)			100.00%
Concentrations (as a percent)			74.00%
Number of customers \| customer			2
Purchase price			$ 37,000,000
Bayonne
Approximate fair value estimates of the assets acquired and liabilities assumed
Purchase price			$ 4,100,000
The Wisconsin acquisition
Approximate fair value estimates of the assets acquired and liabilities assumed
Accounts receivable		$ 0
Purchase price		$ 6,100,000
Community Health Systems Inc.
Acquisitions
Revenues				49,600,000
Operating income				9,300,000
Deal and transition costs incurred				2,400,000
Approximate fair value estimates of the assets acquired and liabilities assumed
Accounts receivable				21,020,000
Prepaids and other assets				705,000
Property, plant & equipment				3,323,000
Goodwill				122,382,000
Intangibles				28,300,000
Assets acquired				175,730,000
Liabilities assumed				(14,759,000)
Non-controlling interest				(32,042,000)
Net assets acquired				128,929,000
Interest acquired (as a percent)	80.00%
Purchase price	$ 128,900,000
Healthcare Innovations
Acquisitions
Revenues				4,559,000	$ 4,392,000
Approximate fair value estimates of the assets acquired and liabilities assumed
Goodwill				$ 36,649,000
Interest acquired (as a percent)				72.00%			61.50%